cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A280853 Number of n X 2 0..2 arrays with no element equal to more than one of its king-move neighbors and with new values introduced in order 0 sequentially upwards.

Table of values

n a(n)
1 2
2 9
3 29
4 110
5 442
6 1708
7 6596
8 25624
9 99432
10 385584
11 1495696
12 5802080
13 22506144
14 87301312
15 338644032
16 1313606016
17 5095497344
18 19765519104
19 76670777600
20 297407202816
21 1153647430144
22 4475017382912
23 17358666073088
24 67334551345152

List of values

[2, 9, 29, 110, 442, 1708, 6596, 25624, 99432, 385584, 1495696, 5802080, 22506144, 87301312, 338644032, 1313606016, 5095497344, 19765519104, 76670777600, 297407202816, 1153647430144, 4475017382912, 17358666073088, 67334551345152]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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